Table 3 Box-Behnken factorial experimental design, representing the response of oil degradation as influenced by glucose, petroleum oil, and pH for C. tropicalis strain B
Trials | Variables | Oil consumption (%) | ||
|---|---|---|---|---|
X1 | X2 | X3 | ||
1 |  + 1 |  + 1 | 0 | 54.9 |
2 |  + 1 | − 1 | 0 | 41.8 |
3 | − 1 |  + 1 | 0 | 18.8 |
4 | − 1 | − 1 | 0 | 12.5 |
5 |  + 1 | 0 |  + 1 | 0.7 |
6 |  + 1 | 0 | − 1 | 9.9 |
7 | − 1 | 0 |  + 1 | 25.0 |
8 | − 1 | 0 | − 1 | 18.0 |
9 | 0 |  + 1 |  + 1 | 22.6 |
10 | 0 |  + 1 | − 1 | 40.0 |
11 | 0 | − 1 |  + 1 | 71.0 |
12 | 0 | − 1 | − 1 | 25.0 |
13 | 0 | 0 | 0 | 22.0 |
Variables | Code | ||
|---|---|---|---|
− 1 | 0 |  + 1 | |
Glucose (g%) (X1) | 1 | 2 | 3 |
Petroleum oil (g%) (X2) | 1 | 2 | 3 |
pH (X3) | 6 | 6.5 | 7 |